I believe these butt plates
are cost saving.
In making wood parts, there is considerable loss due to drill travel when drilling the holes in the birds eye.
This is why we travel the hammer shanks, to adjust for drifted center pin holes.
Vertical butts get a lot of work fitting backchecks, felts and leathers before they can be installed on the rail and traveled. Correcting travel errors takes time and interrupts work flow an the assembly line.
A shallow saw kerf across the back of the butt can be cut accurately, minimizing the need to travel after assembly of the action.
They probably also save time pinning the flanges to the butts. Pin the flange, soak and dry to size the bushing, clamp on the butt and it's done.
The introduction of plastic flanges and butts has largely solved this problem.
A few years ago I saw a video of a robot testing shanks and flanges in the Kawai factory; quick and certain; any part that drifts on movement is discarded, thus virtually eliminating the need to travel shanks and flanges when the actions are assembled. [Up for correction, Mr. Mannino!]
------------------------------
Ed Sutton
ed440@me.com(980) 254-7413
------------------------------
Original Message:
Sent: 03-31-2018 09:52
From: Larry Fisher
Subject: Screwy upright flange setup
There's numerous Kawai UST's out there that use these as well. I know of one at a community college that I've only had to deal with the loose screw and walking pin once.
I agree that they've got to be more expensive to make.
Original Message------
I have several Walter studios with this flange set up. If you catch the 'walking' early it is a benefit to be able to tighten the plate which is simple to do. One of these pianos is in a college dorm and I have not had to do this but a few times in 15 years. It may be more common in the newest one.
------------------------------
Cindy Strehlow
Urbana, IL
------------------------------